A winter storm is taking shape for the Northern Rockies beginning on Friday. At this time, snowfall amounts of at least 4 inches are expected in valley locations, with over 8 inches in the mountains and at mountain passes. Higher snowfall amounts, exceeding 12 inches in the mountains and 6 inches in valleys, are possible. Reduced visibility from falling and blowing snow can be expected. In addition, a flash freeze is possible on area roads from rapidly falling temperatures Friday night into Saturday morning. Continue to monitor the forecast for the latest updates on this developing storm.